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· Are you using the RC (Release Candidate) version or RTM (Release to Manufacturing) version of Windows seven?
If you are using the RC version, you have to wait until the full version is released. If you are using the RTM version do the following steps which can help resolve your issue.
- Click on start and type diskmgmt.msc on search bar (on Run command)
- This will open the Disk Management interface that is displaying all connected hard drives and partitions.
- Now select Drive from lower half of your disk management interface which doesn’t have any drive letter.
- Right Click & Select “Change Drive Letter and Paths” from the context menu.
- Now click on the Add button in the next menu and pick a drive letter from the pull down menu.
- Click ok to assign selected drive letter and check your windows explorer or my computer to confirm missing drive of windows 7 is shown up or not.
Check the link Change, Add, or remove a drive letter http://windows.microsoft.com/en-US/windows-vista/Change-add-or-remove-a-drive-letter
Diana
Microsoft Answers Support Engineer
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